Since upgrading to IOS 9.2.1 my wife’s ( but not my) mail app crashes and will not allow her to read emails nor to reply etc. Mail opens and when she chooses an email it crashes going to the phone’s main screen. We both have 6 pluses. She does soft resets, which used to work temporarily but not now. I did a factory reset and restore: that lasted 12 hours and now the problem is back. I have seen online that others are having problems with this. I’ve tried all the solutions given to no avail. I tried to revert to IOS 9.2 but could not find a signed IPSW file for that. This is a big, big problem for her as she has to conduct business on the run and depends on this phone. If I go to an genius bar would they revert it back to 9.2 until Apple fixes this (I hope) and soon (I hope, I hope). Any suggestion?